Recirculation, Rolloff, Phase; Echo; Reverberation - Lexicon Prime Time 93 Owner's Manual

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To overlay the repeating segment with new source material bring up IN and
AUX inputs at the OUTPUT MIX, or select 0 delay which will send the INPUT
MIX signal to the respective delay tap. Use the 0 delay setting to recirc-
ulate and bandwidth limit the input through the ROLLOFF and DELAY MULTIPLY
functions. See section 3.4 for an explanation of the ROLLOFF and RECIRCULATE
functions. This allows some flexibility in creating the output mix even
though the new input material cannot be delayed.
3.4 RECIRCULATION, ROLLOFF, PHASE
See FIG. 3. 5
At this point virtually all of the functions of M.93 have been covered and
with them corresponding delay effects. But, with the exception of REPEAT
HOLD, none of these effects have been sustained. The delayed effects lasted
2.048 seconds at most. This section will cover sustained effects -- more
natural sounding reverberation and echoing and bizarre feedback resonance
effects. It will also cover a few fine points and variations of already
familiar effects.
ECHO
Set up an echo effect as described in section 3.1 with delays A and B set
to 97 and 128 msec respectively, DELAY MULTIPLY at 4X, and an OUTPUT MIX of
IN, A and B in order of descending levels. The result is the source with
two "slap
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echoes. But now bring up A and B in the INPUT MIXER (not so far
as to cause limit) to hear recirculated delays increasing in number (echo
density) until they die away. The ROLLOFF controls determine the bandwidths
of the recirculating delays. Decreasing the ROLLOFF frequency corresponds
to high frequency absorption from reflecting surfaces and through air -- sim-
ilar to the bandwidth limitations of the DELAY MULTIPLY function, but at a
gentler 6dB/octave slope.
REVERBERATION
In a similar manner the RECIRCULATE and ROLLOFF functions enable the simula-
tion of reverberation at lower delay settings. Reduce the delay times by de-
creasing the DELAY MULTIPLY factor from 4X to 2X and to lX noticing that the
apparent room size decreases correspondingly. Significant amounts of recirc-
ulation at relatively small delay times will display some unnatural side
effects, particularly if the delay times contain common numerical factors.
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